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anyone know if tt600 cam fit xt600 ??? anyone know if tt600 cam fit xt600 ???
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 25 Jul 2014
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anyone know if tt600 cam fit xt600 ???
can anyone tell me dose a mid 80s tt600 cam fit my 91 xt600 and are the cam lobes on the tt600 a bit more sharp looking ? Thanks
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Old 25 Jul 2014
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Pretty much the same cam. I'm not 100% positive that the lobes are exactly the same between the '80's kickers and the '90's e starts but the ones I've seen appear identical , if not the TT would be more aggressive I would think.
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Old 25 Jul 2014
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Should be the same I think....only difference really in engines was the air intake system and carb settings between the tt and xt....
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Old 26 Jul 2014
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34K-12171-00-00 is for an 84 TT
43L-12171-00-00 is for an 84 XT Of course both not available new from Yamaha. There must be some difference, I know the carbs are more adjustable on the USA models of the TT
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Old 26 Jul 2014
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The way Yamaha usually numbered things , the first series were just the model, aka ,TT or XT , or XJ ect.. The middle series(second and third set) is the actual part number , fourth is like an option or revision of the part. It usually comes out pretty reliable this way , but not foolproof. Newer parts I can't say if they follow that but these older one do . I would say that those are the same part.
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Old 26 Jul 2014
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Bugger ! I was hoping someone would tell me for sure that the TT cam will fit and its a bit less smog friendly and go a bit better Thanks guys
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Old 26 Jul 2014
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Quote:
Originally Posted by jjrider View Post
The way Yamaha usually numbered things , the first series were just the model, aka ,TT or XT , or XJ ect.. The middle series(second and third set) is the actual part number , fourth is like an option or revision of the part. It usually comes out pretty reliable this way , but not foolproof. Newer parts I can't say if they follow that but these older one do . I would say that those are the same part.
I have been googling yamaha numbering and found that you are NOT entirely correct. The first 3 letter/number combo is the first model the part came out on. If that number is different and even if the remaining numbers match, the part "COULD" and probably is different. If it were the same, they would use the same number. Yamaha builds bikes from parts, what they don't have already, they engineer new or modify. If the part is changed significantly, a new number is attached, if a part is just IMPROVED, the suffix is increased in value.

So there is NO hard and fast rule. As to the TT cam being different, I'd bet it is, only way to tell is side by side comparison unless you can find the specs for them.

Since the TT carbs have adjustable needles and richer jets, it goes that the cam could be more aggressive since it did not have to meet emission standards.

Not trying to argue but shed some light. I've heard this discussed on other Yamaha forums, not XT forums, so I've been exposed to the debate, after all this is a learning forum, I learn all the time and appreciate the time others put into "teaching" us....

Steve
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Old 26 Jul 2014
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I know that isn't an exact system, I said it wasn't foolproof. Just a theory. I did miss state that first number meaning, it seemed to usually be the designation of the model that part was ORIGINALLY designed for, not just the model it is on.Even that wasn't always right but did seem to follow . When building my hybrid motor I've found a lot of the numbers did work that way, some has the middle series as the part itself (like axle,or cam,or valve) then the following seemed to be the variances. Either way, most of them were the same if all the last sections were the same and just the first changed. That"s how I even got the motor built in the first place, going by part numbers to see what fit together. I'll bet there isn't a difference . The carb differences I'd say were more for better tuning and gaining a bit of hp since it was the "dirt bike" and used in all sorts of conditions , including racing.
Last edited by jjrider; 26 Jul 2014 at 17:08.
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Old 27 Jul 2014
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We are on the same page....
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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